I think Romney's platform will be "Deficit Reduction" and "Balance the Budget"
these are 2 platforms that helped Bill Clinton get elected and they should work again.
Now Obama has tried to jump on the Deficit bandwagon, but no one will believe him.
Why would anyone believe Romney? He has zero credibility on this issue and many others beside. That's because he always try to shape his message to his audience and hasn't learned he can't keep his audiences from comparing what he says at different times. He's called for tax cuts and defense spending increases without specifying how he would offset their effect on the budget. Enacting what Romney has said he would do would increase the deficit, not decrease it.
Tax cuts, increased defense spending, and balancing the budget are all popular, but unless you massively slash Social Security, Medicare, and/or Medicaid, there is no way to get all three done. Romney hasn't even proposed cuts to the social programs sufficient to keep the government at its current deficit levels if he got the tax cuts and defense spending he said he wanted. We tried cutting taxes and increasing military spending under Bush and the deficit soared. Does Romney think the voters are dumb enough to believe that if does it, the deficit will shrink? (Granted, the voters are sometimes dumb, but not when they've already experienced what is being proposed.)
